Boot device not found. Please install an operating system on your hard disk.

[Soukhya]

I’ve encountered the error ‘Boot device not found. Hard disk (3F0)  when I’m starting my computer. Tried following the steps like harddisk check, turning off and turning te system on again and l Setting the BIOS to default. But, Nothing worked. Please let me know what can be done to resolve this. I’m a student and I literally have half a dozen of assignments due the coming week. Help me by getting this resolved please. 

[itsmyname]

@Soukhya -- the motherboard assigns a code to each SATA connector on the motherboard. So, "3F0" is assigned to the first SATA device, which usually is your disk-drive.  So, there is a big problem with your disk-drive.

The best & quickest resolution is to take the computer to a professional technician, for trouble-shooting.

If you are at a post-secondary institution, do they have a "Computer Help Desk", and maybe some professional technicians that can fix your computer?